Question about 1991 Chevrolet Silverado 2500

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Ac compressor won't kick on

Ok.... 91 chevy 1500 pickup. When I turn the ac on the ac display flashes (never seen that before) and the compressor wont kick on. Freon is good, checked for voltage at the switch on the accumulator, no voltage. ran 12volts to the dark green wire on that switch, compressor kicks on ac is ice cold. where do we go from here. Any help is greatly appreciated.

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  • Anonymous Mar 13, 2014

    I got a 08 Chevy Impala LT and AC charged after changing radiator and condensor. THey filled it with freon but couldnt check cause compressor wouldnt engage...flashing AC light when depressing the AC button. They said its cause it is too cold out. I dont want to leave it unconfirmed working. Can I Create a Work Around to the Ambient Air Temp Sensor to get the Compressor to engage? P.S. IT is 30 degrees here

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Just had the same issue and posted. Just found the solution is the control module in the dash. Went to the junk yard since new is expensive on these units. Plugged new unit in, was able to charge a/c now blows cold as ice.

Posted on Jun 11, 2009

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